A Star to Steer Her by: A Self-Teaching Guide to Offshore Navigation (Paperback)

by Edward Bergin (Author)

Product Details

• Paperback: 200 pages
• Publisher: Cornell Maritime Press; 1st edition (November 1983)
• Language: English
• ISBN-10: 0870333097
• ISBN-13: 978-0870333095
• Product Dimensions: 11 x 8.5 x 0.6 inches
• Shipping Weight: 1.4 pounds (View shipping rates and policies)
• Average Customer Review: 1.0 out of 5 stars See all reviews (1 customer review)
• Amazon.com Sales Rank: #494,741 in Books (See Bestsellers in Books)

Customer Reviews

Most Helpful Customer Reviews

1 of 3 people found the following review helpful:

1.0 out of 5 stars Has a troubling diagram, July 26, 2006

By	J. Shields (Pittsburgh, PA) - See all my reviews (REAL NAME)

The book does an adequate job at teaching the "how to do" celestial navigation, cookbook style. The "theory" section on "how it works" bothers me because it uses a diagram where the earth is shown as flat and the star so close to the earth that it erroneously explains the difference in angle (as you move away from the position directly under the star) by simple trigonometry. In reality, stars are so far away that light rays from them are essentially parallel no matter where you are on earth (the sun and moon are closer and need a parallax correction, but this is a minor adjustment), so the difference in angle is due to the curvature of the earths surface. Understanding that the difference in angle is due to the curvature of the earth is so essential to understanding celestial navigation and why you need spherical trigonometry to solve this, I think the book does a disservice to the student by over simplifying it.